Research Article

|

2019, 12(5): 1041–1047

|

https://doi.org/10.1007/s12274-019-2337-4

Nitrogen-doped graphene quantum dots: Optical properties modification and photovoltaic applications

Md Tanvir Hasan1,§, Roberto Gonzalez-Rodriguez1,§, Conor Ryan1, Kristof Pota2, Kayla Green2, Jeffery L. Coffer2, and Anton V. Naumov1 (*)

View Author's information

1 Department of Physics and Astronomy, Texas Christian University, TCU Box 298840, Fort Worth, Texas 76129, USA
2 Department of Chemistry and Biochemistry, Texas Christian University, TCU Box 298860, Fort Worth, Texas 76129, USA
§ Md Tanvir Hasan and Roberto Gonzalez-Rodriguez contributed equally to this work.

Keywords: nitrogen-doped graphene quantum dots, ozone treatment, optical properties, photovoltaics, solar cells
Full article PDF
Cite this article(Endnote)
Share this article
Metric

views: 261

Citations: 0

  • Abstract
  • References
  • Electronic Supplementary Material
In this work, we utilize a bottom-up approach to synthesize nitrogen self-doped graphene quantum dots (NGQDs) from a single glucosamine precursor via an eco-friendly microwave-assisted hydrothermal method. Structural and optical properties of as-produced NGQDs are further modified using controlled ozone treatment. Ozone-treated NGQDs (Oz-NGQDs) are reduced in size to 5.5 nm with clear changes in the lattice structure and ID/IG Raman ratios due to the introduction/alteration of oxygen-containing functional groups detected by Fourier-transform infrared (FTIR) spectrometer and further verified by energy dispersive X-ray spectroscopy (EDX) showing increased atomic/weight percentage of oxygen atoms. Along with structural modifications, GQDs experience decrease in ultraviolet–visible (UV–vis) absorption coupled with progressive enhancement of visible (up to 16 min treatment) and near-infrared (NIR) (up to 45 min treatment) fluorescence. This allows fine-tuning optical properties of NGQDs for solar cell applications yielding controlled emission increase, while controlled emission quenching was achieved by either blue laser or thermal treatment. Optimized Oz-NGQDs were further used to form a photoactive layer of solar cells with a maximum efficiency of 2.64% providing a 6-fold enhancement over untreated NGQD devices and a 3-fold increase in fill factor/current density. This study suggests simple routes to alter and optimize optical properties of scalably produced NGQDs to boost the photovoltaic performance of solar cells.
Related Article
Cite this article

Nitrogen-doped graphene quantum dots: Optical properties modification and photovoltaic applications. Nano Res. 2019, 12(5): 1041–1047 https://doi.org/10.1007/s12274-019-2337-4

Download citation